This CR1632 Battery will replace the old one from your 2010 LEXUS LX570 Smart key, Please make sure you have this CR1632 number on the old battery, if you have no battery available in your smart key, you may find the battery number on the back cover of your 2010 LEXUS LX570 Smart key, Please gave us a call if you have not found any numbers on your Samrt key.